Sander attachment for shaping machines



1953 P. P. 'ZWIREK SANDER ATTACHMENT FOR SHAPING MACHINES Filed July'19, 1951 5 Sheets-Sheet 1 4. T e U v m r Q 5 5 W U I d 2 a. a P l I 6 25 m n 1 y 1 w av n .w m Y m. at E v I I 6 5 m m m 6 6 2 l l l l l l llfl 2. n vfl hnhhnnn V o l 0 1m 9 4 l w w v ATTORNEY Feb. 10, 1953 p,zwm 2,627,706

SANDER ATTACHMENT FOR SHAPING MACHINES Filed July 19, 1951 5 Sheets-Sheet 2 INVENTOR Pa 21] 2 ZWz'fak MMM ATTORNEY Feb. 10, 1953 zw2,627,706

SANDER ATTACHMENT FOR SHAPING MACHINES Filed July 19, 1951 sSheets-Sheet 5 1N VENTOR ATTORNEY Patented Feb. 10, 1953 UNITED STATESPATENT OFFICE.

SANDER ATTACHMENTFOR; SHAPING MACHINES Paul Peter Zwirek, New Orleans,La., assignor' of one-half to New Orleans Furniture ManufacturingCompany, New Orleans, La., :2. company of. Louisiana 8 Claims.-

The present invention relates to a wood shap smooth surface theretoandthus eliminates hand:

sanding.

Other objects and advantages of the invention will becomeapparent fromthe following description when taken in conjunction with theaccompanying claims and drawings.

Referring to thedrawings inwhich is shown a preferred embodiment of theinvention:

Figure l is a detail plan View ofthe improved sander attachment shownassociated with a shaping machine'and the workr Figure 2 is an enlargeddetail sectional View taken substantially along the line 2-2? of Fig;-ure 1.

Figure?- is a sectional view taken substantially along theline 3-3- ofFigure 1.

Figure 4 Ba sectional view takensubstantially along the fine tl ofFigure 1.

Figure 5 is'a se'ctionalview taken substantiallyalong the line 5-5 ofFigure'l'.

Figure 6 is a detail plan view showing'means for moving the guide wheeland the abradant member out of engagement with the work.

Figure 7 is a detail side view of the basefor supporting the fluidcylinder and its associated parts.

Figure 8 is a sectional view-taken substantially along the line 8-8ofFigure 1.

Figure 9 is a detail perspective view of the means" for connecting thefluid cylinder to the adjustable slide on the base, and

Figure 10 is a detail perspective of a part 01 the front end of thebase.

Referring to the drawings, It (Fig. 3) indicates apattern or jack whichis suitably clamped or connected to the top of a shaper table, notshown.

and which supports the Work H, such as a piece of furniture, thatpreviously has been cut to the desired shape. In order to impart asmooth sandedfinish to thework after it has been shaped by thev cutter,there isprovided a. sander attach"- 2 ment which includes a'fixed baseor supportin member l2 (Fig. 4) having detachably mounted thereon a flatmetal plate- 13- by the bolts l4 soasto constitute a bed on which aredetachably secured the spaced side pieces 15' by the'clampin'g; screwsIS. The inside surfaces of these piecesare inclined or cut at an angleas at H so" as: to engage complementary formed tapered sides [3' of alongitudinally slidable metal member or bar" l9 (Fig. 4); Thus; it willbe seen thattheside pieces 11' coact with' the base t3 to provide a.guideway ofdove-tail shape. for' receiving the slidable member 19. Itwill be seen that upon releasing of the bolts lathe member l9 ma-y beadjusted longitudinally relative to the base: I3'= and upontightening-up ofthe bolts lathe pieces l5 are forcedintoclampingengagement with;v the base and the tapered sides It of themember l9 so as to maintainthelatter in an adjusted: fixed position. Themember [9: adjacent'itsin ner end has a plate 20 (Fig. 1) securedtheretoby the bolts 21 and carriesan upwardly extend ing stud or pin 22on which is clamped a=- split housing- 23 by the threaded. bolts 24. Thehousing. 23 has extending laterally and. outwardly therefrom. areinforcing web 25. and an integral strap 26- (Fig. 9) that abutsagainst the inner end of a fluid. cylinder 2?. Threaded retaining. rods28 extend through openings'in-thev plate-2'6" and the chamber head 29'of-' the cylinder 21' so. as to maintain the cylinder infixedpositionwhen the nuts 3i] are secured tov the ends of. the rods. 28. Areciprocating piston 35 extends outwardly fromthe chamber Not thecylinder 21' and also through. a guide plate. 32' that projectslaterally from the. side of the base it; A stop member 33. is axiallyadjustable on a rod" 34" which is; connected at one end to a-slidable'tubular'boss- 35 on the plate. 32 and at its opp'osit'e end. extendsloosely through thelug-tt. on. the headI-ZQ, so as to be movablerelativethereto. An extension plate 3'!- projects from thev plateZitandkmay. be secured thereto by the. bolts 28 andlnut's. 3'il'l (Fig.1).. A complementary. plate. 38 parallel! with. the. plate. 37 extendsoutwardly from.v the plate. 32 and-may be secured thereto by the bolts32 (Fig. 10 A rod. 39. extends. through the: plates tl and 38 andcarries: a sleeve 4i] between which and the plate 38 is confined atension spring. 4|. threaded to-receive anut 12 and also carries acollar 43 betweenv which and the plate 38--is positioned a compressionspring 44.

The adjustable slidablemember lil is of such a. length asto extendbeyond; the; oppositeends The. outer end of the. rod 39." is

of the base l2 and at its inner end or adjacent the work II, ispivotally connected to a motor supporting arm 45 as at 46 (Fig. l). Aplate or strap 41 has a lug 48 projecting rearwardly therefrom andoverlaps a strap or extension 3| connected to the outer end of thepiston 3!. The lug 48 may be pivotally connected to the strap 3| by thebolt 49 and the cotter pin 49, so that axial movement of the piston 3|imparts a swinging movement to the arm 45 and its associated parts,about the pin 46. The opposite end of the plate 47 overlaps the arm 45and may be secured thereto by the spaced clamping bolts 50. Thus, itwill be seen that the plate 41 constitutes an extension of the arm 45 soas to connect the latter both to the slidable member l9 and the piston3| of the cylinder 27. Manifestly, the arm 45 and the plate 4! may bemade in one piece. The supporting arm or member 45 extends laterallyfrom the side of the base l3 so as to be positioned adjacent the work Hand is preferably bent or curved as at 51 at an angle of substantially45, and terminates in an end portion 52, to the underside of which issecured a metal base member 53 by the bolts 54 (Fig. 2). The undersideof the base 53 is provided with the depending spaced side pieces 55 and55, the piece 55 being detachably connected to the base 53 and the piece55 preferably integrally extending therefrom. The spaced sides 55 and55' coact with the base 53 to provide a substantially dove-tail shapedguideway which slidably receives a complementary formed elongated plate56 (Fig. 3), to the outer end of which is revolubly mounted a wheelarranged to contact with the side of the pattern or support for the workH. An adjusting screw 58 extends through a depending threaded boss 59 ofthe plate 53, so as to engage the arm 56 and regulate the longitudinalmovement of the wheel 5'! relative to the base 53. The rod 58 at itsouter end may be formed with a knurled operating head 58. Spaced setscrews 60 (Fig. 2) extend through the detachable piece 55', so as toprovide means for clamping the plate 56 in a predeterminedlongitudinally adjusted position. An L-shaped bracket 61 has ahorizontal arm 82 (Fig. 3) secured by the bolts 64 to the adjacentcurved end of the supporting arm 45, and the vertical arm 65 of thebracket has an elongated slot 66 (Fig. 2) for slidably receiving alocking bolt 67 for adjustably connecting a supporting plate 68 thereto.An electric motor 69 is connected to the plate 58 by the bolts 69 so asto be supported and be movable therewith. The motor 69 has extendingdownwardly and centrally therefrom, a rotatable shaft H which isdetachably connected to a conventional or wellknown sanding deviceincluding a. drum 12 having a centrally disposed sleeve 13 into whichthe shaft 1! extends and is adjustably secured by the set screws 14. Tothe outer periphery of the metal drum or disc 72 is connected a suitableabradant, such as sandpaper, emery or the like 15, which is arranged tobe brought into finishing engagement with the side of the work Ii afterit has been shaped by the cutter. When it is desired to temporarilysuspend the sanding operation, a protuberance in the form of asemicircular wooden button or the like 76 may be detachably connected tothe side of the pattern or jack (Fig. 6), so as to be positioned in thepath of the roller 51 in order to move the abradant member away from thework H.

The side pieces (5, while shown separate from the base l3, may beintegrally formed therewith in order to provide the dove-tail guideway.The longitudinally adjustable bed member l9 may be provided withthreaded openings for receiving set screws 11 (Fig. 1) that coast withthe clamping screws [5 for maintaining the bed [9 fixed in itslongitudinally adjusted position. Additionally, oil cups 18 may beconnected to the side pieces l5 so as to lubricate the movable surfacesof the member [9 which contact the pieces [5. The motor 69 is connectedby the insulated cable or wire 29 to a source of electrical energy forcausing the rotation of the abradant wheel 75.

In operation, assuming that the work H, such as a piece of furniture,has been shaped by the cutter to form the desired pattern, the sander orabradant attachment is then moved to the position as shown in Figure l.The bed 49 is first longitudinally adjusted to properly position theabradant 15 in engagement with the side of the work and the bed 19 isclamped in a fixed position by tightening-up of the set screws [6 and H.The longitudinal displacement of the bed I!) simultaneously moves thehydraulic cylinder 21 which is connected thereto by the web 25 and theplate 26. At the same time, the plate 56 is longitudinally adjusted soas to properly position the wheel 5'! in contact with the pattern orjack It by the manual actuation of the rod 58, and is clamped in itsadjusted position by tightening-up of the set screws 60 which forces theremovable piece 55 to be brought into tight frictional engagement withthe adjacent tapered face of the bed 55. Air or other fluid i thenintroduced under pressure through the pipes 18 into the head of thecylinder 29, so as to force the piston 31 and plates 32 and 38rearwardly or away from the work it and against the tension of thecompression spring 4|. The rearward movement of the piston 3| is limitedby the engagement of boss 35 with the adjustable strap 33 (Fig. 8). Theinward movement of the piston 3| simultaneously causes the arm 45 toswing about its pivot 46 so as to yieldably urge the abradant surface15, now being rotated by the motor 69, into sanding contact with therough design previously cut by the shaper on the work I I. It will beseen that the sander 15 fits closely into the curves of the design andare held in close yielding engagement therewith by the action of thecompressed air in the cylinder 29 and the tension spring 39. Thus, therough cut made by the shaper is properly sanded and given a smooth anduniform finish, without requiring the manual handling of the material orwork ll.

When the air pressure is released from the cylinder head 29, thecompression spring 44 tends to move the piston 3i outwardly towards thework and the abradant 75 away therefrom. In this connection, it might bementioned that the tension of thesanding device is regulated by the airpressure admitted into the cylinder 27 and also by the tension appliedto the spring 39and the compression spring 44 disposed on opposite sidesof the plate 38 (Fig. 1). The tension spring 4! may be considered asapplying a backward or rearward pressure to the piston 31 and theoperating arm 45, while the compression spring 44 tends to apply aforward pressure which may be adjusted or regulated by the nut 42. Thus,it will be seen that the longitudinal adjustment of the slidable member[9 acts to regulate the depth of force exerted by the sanding wheel orabradant 15 against the work ll. As the piston Si is slidably mounted inthe cylinder 21 and also operatively connected to the arm 45, it is freeto move back and forth in connectionwith the. pressure exerted againstthe work It by the.

abradant 75-. The guide roller- 51 is longitudinally adjusted so as tocontact with the pattern or jack It in order to control the depth ofcutforward in the plate 53, it tends to hold the sanding. surface 15away from the. work, so that the, pressure: exerted on the drum 12 isreduced and consequently the cut made by the sandpaper i5is less andlighter. When it is desiredthat the sandpaper I5 not be brought intoengagement with the work without cutting off the motor 69, or if it isdesired to stop the sander at a certain point in the finished material,the protuberance 16 may be nailed or otherwise connected to the pattern(Fig. so as to move the roller 51 and the sander away from the work, asshown in dotted lines in Figure 6.

Thus, it will be seen that a simple, efficient and positive sanderattachment is provided which can be readily associated with a shapertable or the like in order to impart a smooth finish to the work afterthe same has been shaped by a wood cutter or the like. Additionally,pneumatic means are provided for yieldably maintaining and guiding thesanding wheel in proper position and for effecting ready adjustment ofthe parts, so that the attachment may be conveniently used for providinga smooth sanded finish to various types and shapes of patterns used inmanufacturing furniture and other articles made of wood or the like, sothat the material is at once ready for assembling without requiringmanual handling for sanding the same.

The form of the invention shown is merely illustrative of a preferredembodiment and it is understood that such changes may be made as comewithin the scope of the following claims.

I claim:

1. In combination with a work carrier, a sander attachment for actingupon the work, said attachment including a base, an operating armpivotally connected to the base and extending transversely thereof, saidarm having a curved end portion, a motor mounted on said end portion, anabradant member operatively connected to said motor and arranged to bemoved into sanding engagement with the work, a guide wheel adjustablymounted on said arm and arranged to engage the work carrier formaintaining the abradant wheel in proper position relative to the work,fluid pressure means connected to said operating arm adjacent the otherend thereof for swinging the arm about its pivot in order to move theabradant member in engagement with the work, and spring means operablewhen the fluid pressure means is released for moving the abradant memberaway from the work.

2. In combination with a work carrier, a sander attachment for actingupon the work, said attachment including a base, a longitudinallymovable member adjustably mounted on said base, an operating armpivotally connected to said movable member and extending laterally fromone side thereof, said arm terminating at one end in a curved portion, amotor mounted on said: curved portion, an abradantz member ope.

eratively connected to. saidv motor, a: hydraulic:-

cylinderconnected to. said movable membersd. as to be longitudinallydisplaceable therewith, said cylinder having. a piston connected to;said:

operating arm so as. to. cause the same. to: be swung about its. pivotinorder to move the. abrae dant member in engagement: with. the work; and.

spring means for moving the. operating; arm and; the, abradant, memberaway from; the; work...

3;. In combination with a workicarrier, asanden: attachment'for actinguponthe work, said attache ment including a base, a longitudinallymovable.- member adjustably mounted on. said. base; a. fluid: pressurecylinder spaced.from.said.movable.mem=- ber and having a, reciprocatingplunger,. means connecting. said member to said: cylinder: so; as: tobe. movable; therewith, a. supporting; arm exetending' transversely fromoneendof said move able member, means pivotally connecting saidsupporting arm to said movable member, means operatively connecting saidplunger to said supporting arm for swinging the same about its pivotalconnection with said member, a fixed guideway connected to the oppositeend of said supporting arm, a bar movably mounted on said guideway, amotor mounted on said bar so as to be movable therewith, a rotaryabradant member operatively connected to the motor and arranged tocontact the work to impart a finished surface thereto, and meansarranged to engage the carrier for controlling the position of theabradant relative to the work during the operation of the machine.

4. In combination with a work carrier as called for in claim 3 in whichmeans are provided for introducing fluid under pressure into saidcylinder to move and maintain the abradant member in engagement with thework, and means are also provided when the fluid pressure is released inthe cylinder for moving the abradant member away from the work.

5. An attachment of the class described including a base, a memberslidable on the base, an operating arm extending transversely of saidbase and connected to said member, a fluid pressure cylinder, meansconnecting said cylinder to said member so as to be movable therewith,means for clamping said member in an adjusted position, a guide plate,said cylinder having a piston extending outwardly therefrom and throughsaid guide plate, means connecting said piston to said operating arm,means for introducing fluid under pressure into said cylinder for movingthe piston and said arm in one direction, spring means connected to saidbase and positioned on one side of said guide plate for coacting withsaid piston to move said arm, and a tension spring operatively connectedto said piston and positioned on the opposite side of said guide platefor moving the same and said arm in an opposite direction when the fluidpressure to the cylinder is withdrawn.

6. An attachment as called for in claim 5 in which the clamping meansincludes spaced longitudinally disposed pieces having inclined sidesarranged to engage complementary sides on said member, and means fordetachably connecting said pieces to the base to firmly maintain saidmember in a fixed position.

'7. In combination with a work carrier, a sander attachment for actingupon the work, said attachment including a base, an operating armpivotally connected to the base and extending laterally therefrom, arevoluble abradant member connected to said arm, means operativelyconnected to said arm for moving the abradan t member about its pivotand in engagement with the work, means for moving the abradant memberaway from the work, a guide roller for maintaining the abradant inproper operative position relative to the work, and a detachableprotuberance connected to the work carrier and positioned in the path ofsaid roller for moving the abradant out of engagement with the work.

8. In combination with a work carrier. a sander attachment for actingupon the work, said attachment including a base, a longitudinallymovable member adjustably mounted on said base, an operating armpivotally connected to said movable member and extending laterally fromone side thereof. a revolvable abradant member connected to said arm andmovable therewith for engagement with the work, fluid pressure meansconnected to said longitudinally movable member 8'. and operativelyassociated with said arm so as to cause the same to be swung about itspivot in order to move the abradant member into engagement with thework, and means for moving the 5 arm and abradant member away from thework.

PAUL PETER ZWIREK.

REFERENCES CITED The following references are of record in the m file ofthis patent:

UNITED STATES PATENTS

